Renamed the Error page in the Website library target as NotFound.

Services/Website/Tests/Library/Cases/Internal/Pages/NotFoundPageTests.swift

@@ -5,16 +5,16 @@ import Testing
 @testable import WebsiteLibrary
 
 @Suite(
-    "ErrorPage page",
+    "NotFoundPage page",
     .tags(.page)
 )
-struct ErrorPageTests {
+struct NotFoundPageTests {
     
     // MARK: Functional tests
 
     @Test
     func `renders its markup`() {
-        let html = ErrorPage(
+        let html = NotFoundPage(
             locale: .init(identifier: "en")
         ).render()